Table 5. Correlation matrix for the changes (Δ) of ten functional values as a result of preoperative pulmonary rehabilitation.
| Variables | ÄChest wall extensions (cm) | ÄFEV1 (%pred) | Ä6MWD (m) | ÄFVC (%pred) | ÄBreath holding time (s) | ÄGrip strength (kg) | ÄCAT | Cycle ergometry—Ätime (minutes) | Cycle ergometry—Äpower (watt) | Cycle ergometry—Ädistance (km) |
|---|---|---|---|---|---|---|---|---|---|---|
| ÄChest wall extensions (cm) | 1.0000 | – | – | – | – | – | – | – | – | – |
| ÄFEV1 (%pred) | −0.1116 | 1.0000 | – | – | – | – | – | – | – | – |
| Ä6MWD (m) | 0.1589 | −0.0053 | 1.0000 | – | – | – | – | – | – | – |
| ÄFVC (%pred) | −0.1668 | 0.6484* | −0.1066 | 1.0000 | – | – | – | – | – | – |
| ÄBreath holding time (s) | 0.4271* | 0.0355 | 0.1005 | −0.1141 | 1.0000 | – | – | – | – | – |
| ÄGrip strength (kg) | 0.2148 | −0.0615 | −0.0494 | −0.1439 | 0.1584 | 1.0000 | – | – | – | – |
| ÄCAT | −0.1991 | −0.0128 | −0.4021* | −0.0245 | −0.1288 | 0.0012 | 1.0000 | – | – | – |
| Cycle ergometry—Ätime (minutes) | 0.1631 | −0.1808 | −0.0099 | −0.1921 | −0.0815 | −0.1420 | −0.0045 | 1.0000 | – | – |
| Cycle ergometry—Äpower (watt) | −0.1312 | −0.0772 | 0.0198 | −0.1402 | 0.1233 | −0.0853 | 0.0882 | 0.0493 | 1.0000 | – |
| Cycle ergometry—Ädistance (km) | −0.0939 | −0.2340 | 0.0690 | −0.0968 | −0.1150 | −0.1781 | 0.0548 | 0.6742* | 0.1993 | 1.0000 |
*, correlation coefficients that reach significance level. FEV1, force expiratory volume in the first second; FVC, forced expiratory volume; 6MWD, 6-minute walking distance; CAT, COPD assessment test; COPD, chronic obstructive pulmonary disease.